CN2333715Y

CN2333715Y - Device for titanium plate nitriding using general ion nitriding apparatus

Info

Publication number: CN2333715Y
Application number: CN 98221738
Authority: CN
Inventors: 邓光华
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 1998-07-02
Filing date: 1998-07-02
Publication date: 1999-08-18
Anticipated expiration: 2008-07-02

Abstract

The utility model discloses a device which uses ordinary plasma nitrizing devices to carry out titanium plate nitrizing. The utility model is formed by the method that titanium and the alloy plates are clamped by a titanium jig in a certain distance and are erected on a titanium cathode disc to carry out plasma nitrizing, an armored thermocouple of a casing insulation porcelain pipe is used for measuring temperature in the process of processing, and the heat end is contacted with the inner surfaces of temperature measurement holes on a titanium plate which is especially used for measuring temperature. When the device is used, ordinary plasma nitrizing devices can be directly used for achieving high temperature (equal to 800 DGE or more than 800 DGE) which is needed by titanium material nitrizing, a heat source system need not to be added, and the utility model has the advantage of convenient installation and is suitable for batch processing. Therefore, not only the functions of ordinary plasma nitrizing devices can be enlarged, and meanwhile, the utility model is favorable to the generalization and the application of the reinforcement technique of titanium and the alloy nitrizing.

Description

The device that carries out the nitriding of titanium plate with conventional ion nitriding equipment

The utility model relates to a kind of conventional ion nitriding equipment that can directly utilize and reaches the required pyritous device of titanium material nitriding.

Numerous studies show that, for strengthening titanium and the wear resistance of alloy material and the nitriding intensive treatment that resistance to reduction dielectric corrosion ability is carried out, its temperature requirement is up to more than 800 degree.The using plasma nitridation technique, though have than the gas nitriding process cycle short and lack, advantage such as pollution-free, but desire to reach above-mentioned high temperature then is that conventional ion nitriding equipment (maximum operation (service) temperature is generally about 650 degree) is difficult to be competent at, and therefore often needs to set up the heat system.By retrieval as can be known, external report (E.S.Metin and O.T.Inal, Light Metal Age, 1989,47 (9/10): 26～30) think: must be equipped with direct current pulse power source, therefore but will make equipment complicated and cause facility investment to increase domestic report (" ion bombardment penetration and diffusion technique " Beijing of Yang Lieyu etc.: People's Transportation Press, 1990; 82～99), then take near workpiece, to be provided with the profiling auxiliary cathode, but therefore can strengthen energy expenditure, and be unsuitable for batch processing.

The purpose of this utility model is to provide a kind of device that is suitable for batch processing and can utilizes conventional ion nitriding equipment to carry out titanium and sheet alloy nitriding thereof simple in structure.

For this reason, the utility model is to produce aura superposition (concentration of energy) effect when borrowing between this negative electrode and the workpiece geseous discharge according to the effect that the profiling auxiliary cathode is set, it is hollow cathode effect (HCE) and make workpiece this principle that reaches a high temperature, in the conventional ion nitriding furnace, be equipped with a kind of device that can the titanium plate is arranged in parallel with a determining deviation, so that generally under the nitriding condition (operating air pressure and voltage range) make between the sheet material and directly to produce the HCE effect, cause aura superposition or concentration of energy, thereby reach its required nitriding pyritous effect.This device is on the cathode disc of the sheet material clamping abreast and the titanium system of being erected in titanium jig; promptly rest the master each titanium plate is equally spaced horizontal one by one; on the auxilliary anchor clamps three parallel but become between the titanium rail of triangle column; wherein two of main folder tool titanium rails are flat on the cathode disc; the single titanium rail of auxiliary clamp then is pressed in the middle part of each plate upper end; one end of this rail is enclosed within on the vertical support bar of anchor clamps; but can regulate and locking along the bar easy on and off; titanium system negative electrode is to form and be enclosed within cover dish on the former steel cathode disc with thin titanium board according to the specification of former steel cathode disc and dimensioned; the negative electrode gap protection device of former cathode disc bottom is constant; adopt the armoured thermocouple of overcoat porcelain tube to carry out thermometric, its hot junction with specialize in the titanium plate that thermometric uses on the thermometer hole internal surface contact.

The utility model is compared with conventional device, be a kind of have need not to set up new heat source system, save auxiliary cathode, frock is easy, thermometric is accurate, and be suitable for advantages such as titanium plate batch processing, the purposes of conventional ion nitriding equipment be can not only enlarge, and the popularization and the application of titanium and alloy nitriding intensifying technology thereof helped.

Below with reference to drawings and Examples the utility model is further described:

Fig. 1 is the aura superposition principle synoptic diagram when producing HCE between the utility model parallel plate

Fig. 2 looks synoptic diagram for master of the present utility model

Fig. 3 is a schematic top plan view of the present utility model

Fig. 4 looks synoptic diagram for a left side of the present utility model

Fig. 5 is a stereographic map of the present utility model

Among the figure 1 be the main folder tool, 2 for auxiliary clamp, 3 for the tab-delimited slide block of inverted U, 4 for support bar, 5 for tight fixed bolt, 6 for the titanium plate, 7 for the titanium plate used for thermometric, 8 for thermometer hole, 9 for armoured thermocouple (overcoat insulation porcelain bead), 10 for former steel cathode disc, 11 for titanium system dish cover, 12 for the lateral clearance protector of first wife's negative electrode, 13 for the longitudinal gap protector of first wife's negative electrode, 14 for cathode column, 15 be that insulation covering, 16 is a furnace hearth plate.

Fig. 1 is the aura superposition principle synoptic diagram when producing HCE between the utility model parallel plate, and wherein Y is the negative glow district, and H is a negative glow, and 2 of abscissa A, B are respectively plate A and plate B, and ordinate is light intensity I.Be illustrated under the certain operating air pressure and volts DS, between two parallel plate A and plate B apart from d with cathode fall section length dk and the discharge length L _kSatisfy dk＜d/2 or d＞L _kDuring＞d/2, the negative glow superposition to occur and make concentration of energy among two plates, so that it is maximum that its light intensity reaches, and because of photovoltaic effect, make plate surface secondary electron and number of photons showed increased again, when causing the general glow discharge of current density ratio Senior Three doubly more than, reach 7～12MA/cm2, thereby can make the temperature of sheet material obviously surpass the intrinsic top temperature of equipment (650 degree).But for fear of producing arc discharge because of overcurrent, size that must control d makes it can satisfy above-mentioned relation in specified operating air pressure and voltage range, unlikelyly again causes the undue concentration of energy and arc discharge takes place.

In Fig. 2, Fig. 3, Fig. 4, the tab-delimited slide block 3 of titanium rail, the titanium rail of auxiliary clamp 2, inverted U (about long 15mm), support bar 4 and tight fixed bolt 5 by main folder tool 1, should make the spacing keeping parallelism of sheet material with 15mm, and can be erected on the cathode disc, can also vertically place the titanium plate 6 of any specification on the cathode disc former steel cathode disc 10 overcoat titanium system dishes cover 11 in principle with the parallel clamping of 15mm spacing.Plate lower end and dish are at a distance of more than the 20mm, to guarantee the working gas circulation.Produce the Fe ionic when this cathode construction had both been avoided glow discharge and disturb, saved titanium system negative electrode material, keep the load-bearing rigidity of cathode disc again.7 is the titanium plate of using for thermometric, thermometer hole 8 internal surfaces contact with the hot junction of armoured thermocouple (overcoat insulation porcelain bead) 9, less than 0.5mm, its cold junction draws that stove is outer to be connected with temperature instrumentation to the thermometer hole internal surface, so just can guarantee accurately to reflect titanium plate 6 nitriding temperatures from the distance of outside surface.12,13 be respectively first wife's negative electrode laterally with the longitudinal gap protector, cathode column 14 (connecting power supply negative terminal) separates with insulation covering 15 and furnace hearth plate 16.

Press the utility model device, in ZDL-15A type conventional ion nitriding furnace the TA2 industrially pure titanium that is of a size of 300 * 200 * 2mm being carried out result shows, 730～800pa ammonia press and 650～800 volts of volts DS scopes in, when regulating d=15mm, the sheet material temperature reaches 800～950 degree, handling 4h can make titanium plate surface hardness HV0.1 reach about 1200, nitriding depth 〉=0.2mm, resistance to reduction medium (10～30%HCL and H2SO4) corrosive power is than not tens～tens times of nitriding sheet material raisings (more than 200 times of maximum raising), the level that reaches or be better than reporting both at home and abroad.

Claims

1, a kind of device that utilizes conventional ion nitriding equipment to carry out the nitriding of titanium plate, it is characterized in that with titanium jig on the cathode disc of the sheet material clamping abreast and the titanium system of being erected in, promptly each titanium plate (6) pursue etc. horizontal rest main folder tool (1), auxiliary clamp (2) last three parallel but become between the titanium rail of triangle column, wherein two titanium rails of main folder tool (1) are flat on the cathode disc, the single titanium rail of auxiliary clamp (2) then is pressed in the middle part of each plate upper end, one end of this rail is enclosed within on the vertical support bar of anchor clamps, but can regulate and locking along the bar easy on and off; Titanium system negative electrode is to form and be enclosed within cover dish on the former steel cathode disc (10) with thin titanium board according to the specification of former steel cathode disc (10) and dimensioned; the negative electrode gap protection device of former cathode disc bottom is constant; adopt the armoured thermocouple of overcoat porcelain tube to carry out thermometric, its hot junction with specialize in the titanium plate (7) that thermometric uses on thermometer hole (8) internal surface contact.

2, a kind of device that carries out the nitriding of titanium plate with conventional ion nitriding equipment according to claim 1 is characterized in that titanium jig should make the spacing keeping parallelism of plate (6) with 15mm, and can be erected on the cathode disc.

3, a kind of device that carries out the nitriding of titanium plate with conventional ion nitriding equipment according to claim 1, it is characterized in that thermometer hole on the titanium plate (8) internal surface from the distance of outside surface less than 0.5mm.